How Pleural Mesothelial Cells React In Vitro to Chrysotile Fibres

Our plain-English summary of How Pleural Mesothelial Cells React In Vitro to Chrysotile Fibres, by H. Kaplan, M.C. Jaurand, M.C. Pinchon, et al (1980).

The study

• Authors: H. Kaplan, M.C. Jaurand, M.C. Pinchon, J.F. Bernaudin, J.J. Adnet
• Published: BIOLOGICAL EFFECTS OF MINERAL FIBRES (J.C. WAGNER, EDITOR), LYON: IARC SCIENTIFIC PUBLICATIONS, VOLUME 30., PP 451-457 (1980)
• Type of article: Conference paper
• Our copy: from Johns-Manville's own medical library. The article is still under copyright, so we describe it here rather than post it.

In plain English

This was a laboratory study of rat pleural mesothelial cells (cells lining the chest cavity) grown in culture, by researchers in Créteil and Reims, France. The authors added UICC chrysotile A fibres at 0.5, 1, 2 and 10 micrograms per millilitre and left them with the cells for 48 hours. Under the light microscope, treated cells showed vacuoles (small empty spaces) in their cytoplasm. These disappeared once the cells covered the culture surface, after about 8 days. Regrown treated cells looked like untreated cells. However, the population doubling time was 58 hours for cells treated with 2 micrograms per millilitre and 44 hours for control cells. Concentrations above 20 micrograms per millilitre killed the cells within 48 hours. In pieces of rat pleura removed and exposed to 100 micrograms per millilitre, electron microscopy showed uptake of fibres by the cells. The authors reported that doubling times were reproducible between experiments but that no clear dose-effect relationship was established. They said many more experiments were needed before a statistical analysis could be made.

We wrote this plain-English summary from the full article with the help of AI, and a second AI model checked each sentence against the article. It is not the authors' wording; the abstract and the article are their own account.

What the study did and found

• Design: In vitro laboratory experiment on cultured cells, plus electron microscopy of pleural tissue removed from rats
• Who was studied: Rat pleural mesothelial cells grown in culture, and excised rat parietal pleura, studied at laboratories in Créteil and Reims, France. The number of experiments is not stated in the text.
• Exposure: UICC chrysotile A fibres at 0.5, 1, 2 and 10 micrograms per millilitre for 48 hours. Excised pleura received 100 micrograms per millilitre.
• Main results:
  • Cells treated with 0.5, 1, 2 or 10 micrograms per millilitre showed vacuolization of the cytoplasm under the light microscope.
  • In treated cells, the vacuolization disappeared once the cells became confluent, after about 8 days.
  • Population doubling time was 58 hours for cells treated with 2 micrograms per millilitre and 44 hours for control cells.
  • Chrysotile concentrations higher than 20 micrograms per millilitre were lethal to the cells after 48 hours of incubation.
  • In excised rat pleura exposed to 100 micrograms per millilitre, electron microscopy showed endocytosis (uptake) of chrysotile fibres.
  • Mean population doubling time gave reproducible results from one experiment to another.
• The authors' conclusion: The authors concluded that they had developed a culture system for rat pleural mesothelial cells. They also concluded that sublethal doses of chrysotile (0.5 to 10 micrograms per millilitre) caused structural changes in the cells, mainly cytoplasmic vacuolization, and slightly increased the mean population doubling time at 2 and 10 micrograms per millilitre.
• Limitations the authors state:
  • No clear dose-effect relationship was established for population doubling time.
  • Many more experiments would be needed before a statistical analysis could be made.

Topics

Medical terms in this study, explained in our Lexicon: Mesothelial Cells, Chrysotile, UICC, Pleura.

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